<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<script>
    function fn() {
        for (let i = 0; i < 10; i++) {
            alert(i)
        }
    }
    function f1() {
        alert("f1")
    }

</script>
</body>
</html>